F# Tutorial - Hello World in 10 minutes

Create your app

In your command prompt, run the following command to create your app:

In your terminal, run the following command to create your app:

Command prompt
dotnet new console -lang F# -o myFSharpApp

Then, navigate to the new directory created by the previous command:

Command prompt
cd myFSharpApp

Note: some terminals may require you to add quotes around F# like this: "F#".

The dotnet command creates a new application of type console for you. The -lang parameter specifies the F# programming language and -o creates a directory named myFSharpApp where your app is stored, and populates it with the required files. The cd myFSharpApp command puts you into the newly created app directory.

The main file in the myFSharpApp folder is Program.fs. By default, it already contains the necessary code to write "Hello World from F#!" to the Console.

open System

let main argv =
    printfn "Hello World from F#!"
    0 // return an integer exit code